relation schema

a [[blk:1704138923][relation]] schema $\text{[math]}$ , denoted by $\text{[math]}$ , is made up of a relation name $\text{[math]}$ and a list of attributes, $\text{[math]}$ . each attribute $\text{[math]}$ is the name of a role played by some domain $\text{[math]}$ in the relation schema $\text{[math]}$ . $\text{[math]}$ is called the domain of $\text{[math]}$ and is denoted by $\text{[math]}$ . a relation schema is used to describe a relation; $\text{[math]}$ is called the name of this relation. the degree (or arity) of a relation is the number of attributes $\text{[math]}$ of its relation schema.
[cite:;taken from @elmasri_db_2015 chapter 5.1.1 domains, attributes, tuples, and relations]